在我国航空线分布图上,密布着纵横交错形如蛛网的国内航线、地区航线和国际航线,有人担忧飞机会不会在空中相撞,因而提出种种疑问,其实这种担忧完全是多余的。 不同的飞机,下同的航线有着不同的高度,从而使众多的飞机在各自的高度层航线安全飞行。那么高度层又是如何确定的呢?高度层通常是在地图上将始发站与到达站连成一条直线,根据到达站在地图上的度 On the map of China’s aviation routes, there are many questions concerning the domestic routes, regional routes and international routes densely arranged in a crisscross pattern such as cobwebs. Some people worry that the aircraft will not collide in the air. In fact, such worries are entirely superfluous. Different aircraft, the following routes have different heights, so that a large number of aircraft in their respective flight routes safe flight. Then how is the level of determination? The level is usually on the map will be the originating station and arrival station into a straight line, according to the arrival of the station on the map degree